its being shown in Figs. 2 and 3. It is apparent that these present grip, except that the Trustees will make the modified forms as a simple or double crib. Fig. 4 teeth prevent the logs from slipping or rolling back- connections with the cars on the bridge. Mr. West- shows a simple spring catch by… … dren. When the children are too POLLEYS’ SPIKED SKID. large to use the cribs, the cross piece can be removed from the center machinery to work the present grips and brakes by one person only, in the same manner as locomotive en- easily moved from one level to ahigher. The log can- maining to form a…
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![An illustration from [Catalog] / Copeland, Hall & Co. (1883)](https://img.insideoutlibrary.com/img/200/ia-catalogcopelandh00cope-16-21.webp)
